Activity for Olin Lathropâ€
| Type | On... | Excerpt | Status | Date |
|---|---|---|---|---|
| Edit | Post #280327 | Initial revision | — | almost 4 years ago |
| Question | — |
Cable loops between utility poles? Sometimes cables between utility poles make a loop and do a U-turn. What is the purpose of such loops? The loop I'm asking about is in the lower set of wires towards the left of the picture. These must be communication cables. The 3-phase power is clearly evident at the top of the pole. ... (more) |
— | almost 4 years ago |
| Edit | Post #280139 |
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— | almost 4 years ago |
| Edit | Post #280139 | Initial revision | — | almost 4 years ago |
| Answer | — |
A: is this too obvious for a post? This sounds like it could be a Paper (https://electrical.codidact.com/categories/35) if written up nicely. It doesn't make sense as a question because you're telling, not asking. I haven't heard of this idea before, and I have definitely not used it. It sounds like rather a cute trick. You shou... (more) |
— | almost 4 years ago |
| Edit | Post #280119 |
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— | almost 4 years ago |
| Edit | Post #280119 | Initial revision | — | almost 4 years ago |
| Answer | — |
A: Confused about the amplitude and shape of output voltage pulse Coquelicot's answer explains what is going on, so I won't duplicate that. However, one of the sources of confusion is that you are looking at the two waveforms in isolation. Your scope obviously has at least two channels, since we can see a unused blue line in each picture. Use both channels. ... (more) |
— | almost 4 years ago |
| Comment | Post #280040 |
I just noticed that too this morning, +1. Hopefully someone can fix this. (more) |
— | almost 4 years ago |
| Edit | Post #279988 | Initial revision | — | almost 4 years ago |
| Answer | — |
A: CAN Bus - Internal Oscillator You are making this too complicated. The only thing that matters is the percentage mismatch between any two clocks on a CAN bus. You seem to imply that you are willing to guarantee the -10 °C to +85 °C temperature range, so the oscillator will be within -1.9% to +2.3%. Any two devices co... (more) |
— | almost 4 years ago |
| Comment | Post #279969 |
Or just Shottky diodes to ground and the A/D supply. The Shottkys should kick in before the protection circuitry of the A/D. With a normal silicon junction drop, the internal protection circuitry might take most of the load. (more) |
— | almost 4 years ago |
| Edit | Post #279966 |
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— | almost 4 years ago |
| Comment | Post #279967 |
Your continual small edits are getter rather annoying, as they keep pushing old questions to the top of the active list. Give it a rest already! (more) |
— | almost 4 years ago |
| Edit | Post #279968 |
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— | almost 4 years ago |
| Edit | Post #279968 | Initial revision | — | almost 4 years ago |
| Answer | — |
A: Transformer - Vsec or Current rating parameter In addition to what Andy said (+1), the 350 mA AC figure is probably limited by power dissipation, and therefore temperature. It applies during normal forward operation where the secondary current "unloads" the core as fast as the primary current tries to load it. The 11 V⋅µs figure is... (more) |
— | almost 4 years ago |
| Edit | Post #279966 |
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— | almost 4 years ago |
| Edit | Post #279966 | Initial revision | — | almost 4 years ago |
| Answer | — |
A: Driving ADC with opamp with large rails Is the risk too great? That depends on parameters you haven't told us. How cost-sensitive is this product? What is the reliability expectation of the users? How mission-critical is its usage? For example, if this were a toy, I'd say screw it and look for a way to not even buffer the signal i... (more) |
— | almost 4 years ago |
| Edit | Post #279886 |
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— | almost 4 years ago |
| Edit | Post #279886 |
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— | almost 4 years ago |
| Edit | Post #279886 | Initial revision | — | almost 4 years ago |
| Answer | — |
A: ESD USB Shield Connection & Filtering Your question is impossible to answer without carefully looking at the layout and schematic. However, from gut feel and experience, this smells like poor grounding design. Common mistakes: Not a single board-wide master ground plane. Too many large islands in the ground plane. The metric o... (more) |
— | almost 4 years ago |
| Comment | Post #279860 |
*"can not upload pictures"* is too vague. You should describe exactly what you did, and what the response of the system was. Also, this probably belongs on main meta, where it will likely get more visibility. (more) |
— | almost 4 years ago |
| Comment | Post #279819 |
@2kind: I'm not sure what you mean. There is little difference. Perhaps you are asking about them being stable. They are inherently stable in that they won't run away with oscillations of increasing amplitude. That doesn't mean they can't still be meta-stable with a lower frequency on the output ... (more) |
— | almost 4 years ago |
| Edit | Post #279819 |
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— | almost 4 years ago |
| Comment | Post #279816 |
@Andy: I took that to mean that the point of this circuit is to be an isolated power switch. POWER_IN would be the incoming supply, and POWER_OUT the line being the switched. Presumably the load would be connected between POWER_OUT and some "POWER_RETURN" that is not shown. Perhaps the OP can clar... (more) |
— | almost 4 years ago |
| Edit | Post #279785 |
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— | almost 4 years ago |
| Edit | Post #279819 | Initial revision | — | almost 4 years ago |
| Answer | — |
A: Flyback Converter - Output Ripple Ripple doesn't need to be that high. I've done flyback supplies to power isolated sections quite a bit, using a pulse on demand scheme like yours. It's not hard to get the ripple down to ±50 mV. Usually the ripple is within ±100 mV even when you don't do anything special to minimize ... (more) |
— | almost 4 years ago |
| Comment | Post #279803 |
@dust: Then you have a broken Roomba. Get a new one. This is not something you can fix. (more) |
— | almost 4 years ago |
| Edit | Post #279803 | Initial revision | — | almost 4 years ago |
| Answer | — |
A: How can I debug, (and eventually fix) this Roomba PCB? The charger is supposed to output 20V-24V when the roomba is plugged in. However it's only showing 1.6V. If this is really true, then there is no point going further. The charger isn't working, the Roomba got discharged, and now wont run because it can't be recharged. However, it's not clear w... (more) |
— | almost 4 years ago |
| Comment | Post #279785 |
@Pac: Your second question doesn't make any sense, so I ignored it. (more) |
— | almost 4 years ago |
| Edit | Post #279786 | Initial revision | — | almost 4 years ago |
| Answer | — |
A: Can I ask about debugging/fixing a broken product? Repair questions can be on topic if it's about the underlying electronic principles. Just "How do I fix this?" is off topic. There is little wiggle room for trying to repair a consumer device that you don't even have the schematic for. That doesn't mean you can't, but that such questions are har... (more) |
— | almost 4 years ago |
| Edit | Post #279785 | Initial revision | — | almost 4 years ago |
| Answer | — |
A: Digital multimeter display count range Digital voltmeters generally display decimal digits. The resolution implied by that is not necessarily the same as the underlying binary A/D. Since voltmeters for human display don't need to be fast, but high resolution is good, these usually use delta-sigma A/Ds inside. These can have 20 or mor... (more) |
— | almost 4 years ago |
| Edit | Post #279746 | Initial revision | — | almost 4 years ago |
| Answer | — |
A: Cleaning flux out of USB connectors after soldering Direct answer How to clean off flux depends on what type of flux was used. Most electronic parts can handle being washed in clean water. In fact, boards often go thru what amounts to an industrial dish washer after soldering. If water soluble flux was used, then this will probably work. Chec... (more) |
— | almost 4 years ago |
| Edit | Post #279732 |
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— | almost 4 years ago |
| Edit | Post #279732 | Initial revision | — | almost 4 years ago |
| Answer | — |
A: High Power Switch - High Side vs. Low Side Switching It's still unclear what you are really asking, so I'll discuss the tradeoffs between low and high side switching of power to a load. Low side switching The main advantage of low side switching is that controlling the switch is easier. This is because the logic that decides whether the switch s... (more) |
— | almost 4 years ago |
| Comment | Post #279728 |
That's a bit better, but brings up other questions. Why are there two different FETs back to back for the switch? Where is the load? You mention communications interfaces, but none are shown in the schematics. What's the point of the current sources (I1 and I2 in your schematics)? You also have ... (more) |
— | almost 4 years ago |
| Comment | Post #279728 |
There is way too much hand waving here. Draw a block diagram, and define your terms. We don't know what you think a "LVD domain" and a "PMSM inverter" are. And what is "1.000,00 uF" supposed to mean? Is that really 1 uF to absurd precision, or some screwup with commas and points? (more) |
— | almost 4 years ago |
| Edit | Post #279600 |
Post edited: Sentences start with upper case letters. |
— | almost 4 years ago |
| Edit | Post #279680 |
Post edited: |
— | almost 4 years ago |
| Edit | Post #279680 | Initial revision | — | almost 4 years ago |
| Answer | — |
A: What is the role of the differential amplifier in a delta sigma converter? Your question really comes down to how a delta-sigma A/D works. The A/D internally models the input voltage with a stream of bits. Each bit can only indicate the minimum or maximum voltage. The aim is to make a stream of bits that in the aggregate when averaged together accurately represent the ... (more) |
— | almost 4 years ago |